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Organization Card

MMBU Challenge

Organization for the MMBU challenge splits of the Massive Multimodal Biomedical Understanding benchmark. Questions are full-context, open-ended visual question answering. Each row is one image.

Split Dataset Rows Images
Public mmbu-public 3,162 3,162
Private held-out mmbu-private 9,303 9,303

Task categories: classification, fine-grained classification from a detection box, fine-grained classification from a segmentation mask, object detection, and counting. Prompt format and scoring are on each dataset card.

Paper: MMBU (arXiv:2606.06696). Project page: alejandro-lozano-dev.github.io/MMBU-Website.

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